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Wrong Parts Used in Devices

For those of you who are cirtified testers and or Specialists like myself you may find the following disturbing. In all reality you may know exactly what im writing about. I have tested many units and many pass and sometimes they fail. It's all a part of the process. When they fail I either try to repair or replace, given many varables. How old, condtion, replaceable parts, etc... Over the past few months I have failed about three devices which when I open up to repair I discover the wrong parts installed. For example: I failed a Wilkins 975 for a leaky #1 check. When I opened it up I discovered that the discs were orange. We all know that the orange discs are from the Wilkins 975XL which has replaceable seats. The discs are made of a silicon rubber and are softer then those which are sposed to be used in the 975. Looking at the seats(which are not replacable in this device becuase its a 975) I noticed they were pitted really bad. Now my question is did the tester/repairman before me not know which discs to install or did they install a softer disc to make the device pass? To make my point stronger this is not the first time I've seen this. I guess the moral of the story is, if you are going to repair a device, do your job, and repair or replace it the right way. Dont be lazy. I think I speak for most of us when I say that we really do care about safe drinking water.